Propagation of sound in air

In this animation you can see (approximately) how sound propagates in air. You can choose to display the layers of air between our two characters (hehe) as lines or as particles. Each layer doesn't really move to the right, it just oscillates around its equilibrium position, as it's easier to see if you click on "Color layers".
In the graph you can see how much each layer is displaced from its equilibrium position.
If you choose to display the layers as particles the animation will show you something closer to the real world, with particles of air vibrating fast inside each layer.

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Notes:

• The displacement here is exagerated: no human voice can make layers oscillate so much.
• There is a time speed factor of 0.001 in the animation, wich means that one second in the animation is one millisecond in the real world.
• No human voice can generate a perfect sine wave, only a diapason can, but I preferred to have the picture of a student shouting here, instead of the picture of a boring diapason.